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參數(shù)資料
| 型號： | AD5453YUJZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/28頁 |
| 文件大小： | 0K |
| 描述： | IC DAC 14BIT MULT 50MHZ TSOT23-8 |
| 產(chǎn)品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 設(shè)計資源： | Unipolar, Precision DC Digital-to-Analog Conversion using AD5450/1/2/3 8-14-Bit DACs (CN0052) Precision, Bipolar, Configuration for AD5450/1/2/3 8-14bit Multiplying DACs (CN0053) AC Signal Processing Using AD5450/1/2/3 Current Output DACs (CN0054) Programmable Gain Element Using AD5450/1/2/3 Current Output DAC Family (CN0055) |
| 標準包裝： | 1 |
| 位數(shù)： | 14 |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-8 薄型，TSOT-23-8 |
| 供應商設(shè)備封裝： | TSOT-23-8 |
| 包裝： | 標準包裝 |
| 輸出數(shù)目和類型： | 1 電流，單極；1 電流，雙極 |
| 采樣率（每秒）： | 2.7M |
| 產(chǎn)品目錄頁面： | 782 (CN2011-ZH PDF) |
| 其它名稱： | AD5453YUJZ-REEL7DKR |
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Data Sheet
AD5450/AD5451/AD5452/AD5453
Rev. G | Page 17 of 28
Bipolar Mode
In some applications, it may be necessary to generate a full
4-quadrant multiplying operation or a bipolar output swing.
This can be easily accomplished by using another external
amplifier and some external resistors, as shown in Figure 45. In
this circuit, the second amplifier, A2, provides a gain of 2.
Biasing the external amplifier with an offset from the reference
voltage results in full 4-quadrant multiplying operation. The
transfer function of this circuit shows that both negative and
positive output voltages are created as the input data (D) is
incremented from Code 0 (VOUT = VREF) to midscale
(VOUT 0 V ) to full scale (VOUT = +VREF).
REF
n
REF
OUT
V
D
V
×
=
1
2
where:
D is the fractional representation of the digital word loaded to
the DAC.
D = 0 to 255 (8-bit AD5450).
= 0 to 1023 (10-bit AD5451).
= 0 to 4095 (12-bit AD5452).
n is the resolution of the DAC.
When VIN is an ac signal, the circuit performs 4-quadrant
multiplication. Table 6 shows the relationship between the
digital code and the expected output voltage for a bipolar
operation using the 8-bit AD5450.
Table 6. Bipolar Code Table for the AD5450
Digital Input
Analog Output (V)
1111 1111
+VREF (127/128)
1000 0000
0
0000 0001
VREF (127/128)
0000 0000
VREF (128/128)
04587-
010
NOTES
1. R1 AND R2 USED ONLY IF GAIN ADJUSTMENT IS REQUIRED.
ADJUST R1 FOR VOUT = 0V WITH CODE 10000000 LOADED TO DAC.
2. MATCHING AND TRACKING IS ESSENTIAL FOR RESISTOR PAIRS
R3 AND R4.
3. C1 PHASE COMPENSATION (1pF TO 2pF) MAY BE REQUIRED
IF A1/A2 IS A HIGH SPEED AMPLIFIER.
RFB
IOUT1
GND
SCLK SDIN
VREF
±10V
VREF
R1
SYNC
AD5450/
AD5451/
AD5452/
AD5453
VDD
AGND
C1
A1
A2
R2
VOUT = –VREF TO +VREF
CONTROLLER
R3
20k
R4
10k
R5
20k
Figure 45. Bipolar Mode Operation (4-Quadrant Multiplication)
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相關(guān)代理商/技術(shù)參數(shù) |
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